A New Mechanism for the Alpha to Omega Martensitic Transformation in Pure Titanium
D. R. Trinkle, R. G. Hennig (Ohio State University), S. G. Srinivasan, (Los Alamos National Laboratory), D. M. Hatch (Brigham Young University), M., D. Jones (SUNY, Buffalo), H. T. Stokes (Brigham Young University), R. C., Albers (Los Alamos National Laboratory)
TL;DR
This paper introduces a novel, low-energy pathway for the pressure-induced alpha to omega martensitic transformation in pure titanium, identified through systematic enumeration and energy barrier evaluation.
Contribution
It presents a new homogeneous transformation mechanism with significantly lower energy barriers, advancing understanding of titanium's phase change under pressure.
Findings
New mechanism has at least four times lower energy barrier.
Mechanism remains favorable in nucleation models.
Systematic enumeration of possible transformation pathways.
Abstract
We propose a new direct mechanism for the pressure driven alpha to omega martensitic transformation in pure titanium. A systematic algorithm enumerates all possible mechanisms whose energy barriers are evaluated. A new, homogeneous mechanism emerges with a barrier at least four times lower than other mechanisms. This mechanism remains favorable in a simple nucleation model.
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